Indra Ava Dianta, Agustinus Budi Santoso, and Muh Sabiq. “UTILIZING WHATSAPP API FOR SCHOOL PAYMENT SYSTEM IMPLEMENTATION WITH CODEIGNITER”. JURNAL TEKNOLOGI INFORMASI DAN KOMUNIKASI 15, no. 1 (March 1, 2024): 168 - 177. Accessed May 19, 2024. https://ejurnal.provisi.ac.id/index.php/JTIKP/article/view/844.